Pump



Apri ,1, 1941.

O. H. DORER PUMP .l 1' ,I I |l l l 22 4 ZI i 16 n l i! I l l. :l 20 e i. as -l a7 |11 L9 l '31] 12 l I f w l'| 2 Lll 4, 7 w

` US00/"H Drer" ENToR ATTORNEY pri 1, 1941. Q H DORER 2,237,027

PUMP

Filed Nov. 4, 1938 2 Sheets-Sheet 2 ATTORNEY Patented` Apr. 1, 1941 Oscar H. Dorer, East Orange, N. J., assigner to Worthington Pump and Machinery Corporation, Harrison, N. J., a corporation of Delaware Application November 4, 1938, Serial No. '238,765

1 Claim.

This invention relates to centrifugal pumps. and more particularly to pumps employed in pumping corrosive liquids such as acids.

An object of the present invention is to provide a pump structure for pumping corrosive liquids which embodies a relatively large suction chamber at the suction side of the pump serving the dual purpose of allowing the liquid to ilow freely to the impeller without eddies, and as a priming feature to keep the pump primed at all times, and a pump structure in which there are no stuffing boxes under pressure of liquid pumped.

Another object ofthe invention is to provide a novel construction of pump whereby the impeller may be easily removed from the pump casing for replacement or repair without disturbing the suction and discharge connections of the pump. l

With these and other objects in view, as may appear from the accompanying specification, the invention consists of various features of construction and combination of parts, which will be rst described in connection with the accompanying drawings, showing a pump embodying the invention, and the features forming the invention will be speciiically pointed out in the claim.

In the drawings:

Figure 1 is a vertical section through the improved pump structure.

Figure 2 is an enlarged vertical section through the pump.

Figure 3 is a horizontal section taken on the line 3-3 of Fig. 1.

Figure 4 is an enlarged detailed section of a packing structure employed in the pump.

Referring more particularly to the drawings, the pump casing I is a sectional casing comprising the suction section 2 and the back section 3. The suction section 2 embodies the suction inlet 4 and the discharge volute 5, into which the impeller 6 discharges. The discharge volute 5, which is formed on the suction section 2 of the pump casing, has the discharge outlet connection l formed thereon.

A substantially cylindrical shell 8 rises from the suction section 2 andmay be cast thereon as shown in the drawings, or suitably connected to the suction section 2 by a fluid-tight connection. The cylindrical shell 8 forms a large suction chamber 9 above lthe pump casing I, and opens into the pump casing through the suction inlet 4. The capacity of the suction chamber 9 is such that it will permit the fluid to be pumped to pass f1 eely through lthe suction inlet 4 into the impeller 6 of the pump without eddies and also will provide a suflicient head of iluid to be pumped to always maintain the impeller 6 primed'. The suction chamber 9 has an inlet I0 associated therewith, `and a web II extends into the suction chamber 9 to facilitate the prevention of the formation of eddies therein.

A motor supporting frame or member I2 is sup ported by and rises from the top of the shell 9 and supports the driving motor or prime mover I4 on the top thereof. The motor or prime mover Il is connected to the impeller 5 by means of a vertical shaft I5 and suitable couplings I9' and Il. The riser I9 rises from the suction chamber 9 and has its lower end in communication with the top of the suction chamberv 9. This riser I9 surrounds the shaft I5 and receives evaporation and/or released gases from the suction chamber 9 which escape through a vent 20 near the top of theI riser I9.

A novel forin of stuffing box shown at 2l and more clearly in section in Figure 4 ofthe drawings is provided about the shaft l5 at the top of the riser I9 to provide a seal about the shaft I5, and Aa second seal to prevent any evaporation or released gasses from escaping about the exterior of the riser I9.

The improved packing comprises a' packin containing sleeve 22 which has suitable packing 23 contained therein, and held rmly in packing engagement with the sleeve 24 surrounding the shaft I5 by a packing gland 25. The sleeve 22 has an annular flange 26 thereon which rests against the annular ilange 2l formed on the upper end of the riser I9 and extends outwardly to the support I2. Packing 28 is provided between the perimeter of the ilange 21 and the inner surface of the frame I2. The packing 28 is held in place by a ring 29, which surrounds the perimeter of the annular flange 26. The packing or stutiing box structure 2l prevents leakage of corrosive liquids into the lower section of the cylindrical motor support I2, while the dual ring assembly formed by the flange 26 and ring 29 will serve as a buii'er or shock absorber, preventing vibration and eliminating the necessity of stay bolts or supports for the riser I9.

The pump casing I is supported by a base 30, which has an inturned iiange 3l engaging and attached'lto an annular ange 32 formed on the suction section 2 of the casing I. The bolts 33, which serve to connect the suction section 2 of the casing to thebase 30, also'engage a clamping ring 34, which engages the outer under-surface of the back section 3 of casing I, and securely clamps it in fluid-tight engagement withvcorresponding surfaces formed on the suction casing 2, so that by removal of the clamping ring 34 the 1 back section 3 may be removed to permit ready access to the impeller 6, or to permit easy res moval of the impeller from the shaft I and from within the casing I for purposes of replacement or repair.

The impeller B'has a hub projection I5 formed thereon which threadably receives the lower end of the shaft Il so that when the back section 3 is removed the impeller may be easily disconnected from the shaft I5 and, together with the clamping ringl 34, lowered into vthe supporting base Il.

The supporting base 30 is substantially horseshoe shaped. That is, it has its side 36 open so that the clamping ring 34 andI the impeller may be moved out of the base and thus the impeller may be removed for replacement or repair without in any way disturbing the suction and dist charge line connections with the pump. The back vage which passes about the impeller and the hub section -A suitable drain pipe 38 is connected 2 y 2,2a7,os7

to the lower-most portion of the cup-like extension l1 for carrying on the leakage.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown, but that they may be widely modied within the invention defined by the claim.

What is claimed is: A

In a vertical centrifugal pump, an impeller, a casing'comprising a relatively large substantially cylindrical suction chamber forming section having a uid inlet therein, a portion of said suction chamber forming section shaped' to form the discharge volute `of the pump, an annular disc formed in said casing section and forming the suction side of the impeller enclosing chamber of the casing, a removable hack section forming the back of the impeller enclosing chamber of the casing, a supporting base beneath said suction chamber forming section, a clamping ring within said base for holding saidback section in place, said base provided with an opening in its side to permit removal of said back section, clamping ring and impeller therethrough.

.OSCAR H. DORER. 

